The Secretary of State has type approved the LTI 20.20 for use by the police in the enforcement of speeding offences. Before approval is granted, a device is subjected to operational testing in the field and to tests by the HO Scientific Development Branch and independent test houses to ensure that it complies with the type approval requirements. I am satisfied that if used in accordance with the manufacturer's operating instructions and the code of practice drawn up by the Association of Chief Police Officers the LTI 20.20 will produce evidence that can safely be relied on in court.